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// Other services

Port 311: AppleShare IP WebAdmin

Port 311 is assigned by IANA to asip-webadmin (AppleShare IP WebAdmin).

311

How asip-webadmin works

Other services
client:311asip-webadminresponse client:311asip-webadminresponse

The client sends a request to port 311 and the asip-webadmin service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Well-known (0-1023)
Category
Other services
01 Security

Is port 311 dangerous?

We have no specific security note for port 311. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 311

ServicePortTransportDescriptionReferenceUpdated
asip-webadmin 311 TCP, UDP AppleShare IP WebAdmin - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 311, and is it reachable?

Linux

sudo ss -ltnup 'sport = :311'      # process listening on 311
sudo lsof -nP -i :311

macOS

sudo lsof -nP -i :311

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 311 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 311
netstat -ano | findstr :311

From another machine

nmap -p 311 -sV <host>
sudo nmap -sU -p 311 <host>
nc -zv <host> 311

Block it in the firewall

sudo ufw deny 311/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 311" -Direction Inbound -LocalPort 311 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 311 used for?

Port 311 is assigned by IANA to asip-webadmin (AppleShare IP WebAdmin).

Is port 311 TCP or UDP?

Port 311 is registered for TCP and UDP.

Is it safe to open port 311?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 311 is open?

On Linux run "ss -ltnup 'sport = :311'", on macOS "lsof -nP -i :311", and on Windows "netstat -ano | findstr :311" to see the local process. From another machine, "nmap -p 311 <host>" shows whether it is reachable.

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